Tamping roller



Jan. 25, 1944.

M` E. WHITEMAN TAMPING ROLLER 2 Sheets-Sheet l Filed Aug. 11, 1941 Jan- 25, 1944' M. E. wHl'rEMAN 2340,931

TAMPIG ROLLER v Filed Aug. 11, 1941 2 shee'zs-sneei 2 llm Ilinm Patented Jan. 25, 1944 UNITED STATES PATENT OFFICE TAMPING ROLLER Marvin E. Whiteman, Los Angeles, Calif.

Application August 11, 1941, Serial No. 406,319

3 Claims.

This invention relates to a tamping roller for tamping freshly poured concrete.

An object of the invention is to provide a roller that can be rolled over freshly poured concrete which will be subjected during its rolling movement to the effects of a series of downward blows eifectively applied to the roller thus serving to settle the concrete and to work the fine portions thereof or the fl-oat to the surface. The float on being worked to the surface may thereafter be trowelled or finished if desired.

Heretofore, tamping devices of this general Character have been devised employing rotary eccentric weights within the roller having a tendency during rotation to vibrate the roller. The vibrational movement created by the eccentric weights is in all directi-ons so that some of the eifectiveness of the eccentric weight is to tend to lift the roller from the concrete which is not desired. By means of the present invention the effects of a series of downwardly blows are transmitted to the roller to effectively tamp the concrete without the generation of any air pockets therein.

With the foregoing and other objects in view, which will be made manifest in the following detailed description and specifically pointed out in the appended claims, reference is had to the accompanying drawings for an illustrative embodiment of the invention, wherein:

Figure 1 is a Vertical section through an improved tamping roller embodying the present invention;

Fig. 2 is a partial horizontal section taken substantially upon the line 2-2 upon Fig. 1;

Fig. 3 is a view in end elevation of the tamping roller embodying the present invention;

Fig. 4 is a sectional view taken substantially upon the line l-li upon Fig. 3;

Fig. 5 is a sectional view taken substantially upon the line 5-5 upon Fig. 2; and

Fig. 6 is a Vertical section taken substantially upon the line 8-6 upon Fig. 5.

Referring to the accompanying drawings wherein similar reference characters designate similar parts throughout, the improved tamping roller comprises a suitable handle IEI preferably formed of pipe so as to be hollow. Attached to this handle is a U-shaped fork ll preferably formed of channel iron. In the arms of the fork there are secured bushings |2 within which are mounted hollow trunm'ons 13 attached to the end walls Ill of an internal frame or housing. The trunnions 13 serve to rotatably mount the end wheels |5 of the 'camping roller. These end Wheels are preferably connected by longitudinally extending bars I 6 which in turn are connected intermediate the end Wheels by rings Il. The end Wheels, rings, and bars are surrounded with an outer roller covering which in the preferred form of construction comprises woven Wire screen lt.

The end walls Hi of the internal housing are connected by longitudinally extending angle irons 19 and by an outer covering 2(fl. The angle irons 19 serve as a motor mount for an electric motor 2| which has a driving connection such as by a belt drive 22 with a cam shaft 23. The cam shaft 23 is supported in bearings 24 in cam cases 25 which are likewise supported on the angle irons |9, see Fig. 6. On the ends of the cam shaft and within the cam cases there are keyed cams 26 which are spiral in form having high points 21 and low points 28. The tops of the cam cases provide cylinders 29 within which are reciprocable cam followers ii which are urged downwardly by means of coil springs 3| compressed between cam followers and cylinder caps 32. Stems 33 slidably extend through the caps and are attached to the cam followers and carry heads 34 constituting hammers. The hammers are adapted to be lifted by the cams 25 through cam followers 30 and stems 33 and when the high points 21 pass from beneath the cam followers that are allowed to drop with the result that the heads or hammers 318 impart downwardly directed blows to the anvils or cylinder caps 32.

On the handle Ill there is preferably a switch box 35 to which a cord 36 is connected. Wiring 31 leads from the switch box 35 through the handle and along the interior of the fork ll through a tubular trunnion 13 and to the electric motor 2 l.

When the concrete C is freshly poured the roller may be manipulated thereover by means of the handle ii) during which manipulation the electric motor 2i is driven to drive the cam shaft 23 lifting the hammers and releasing them to impart downward blows to the caps 32. The effects of these downward blows are transmitted through the angle irons I9 and the end Walls |3 to the hubs of the Wheels l that surround the hollow trunnions |3. Thus during manipulation of the roller there is imparted thereto a succession of downward tamping blows that tend to settle the concrete and work the fioat toward the surface. The cams 26 may be so arranged on the cam shaft as to cause the hammers illustrated to be operated in sequence. However, any suitable arrangement of the cams may be employed which will cause the hammers to be operated indvidually, in pairs, or simultaneousiy.

It will thus be appreciated that by means of the improved tamping roller there is provided a means for imparting a succession of downward blows that will be efiectively transmitted to the roller to bring about a good tamping of the freshly poured concrete.

Various changes may be made in the details of construction without departing from the spirit or scope of the invention as defined by the appended claims.

' I claim:

1. A concrete tamper comprising a roller, a frame suspended from trunnions in said roller, a handle connected to the trunnions, the center of gravty of said frame being below the axis of said trunnions, a cam shaft on said frame, a plurality of spring actuated hammers on the frame arranged to be lifted by the cam shaft and allowed to fall under the actions of their springs, and means for rotating the cam shaft whereby a series of downwardly directed impulses will be created by the hammers and transmitted to the ro11er.

2. A concrete tamper comprising a roller, a frame within the roller, a handle for the roller, means connecting the handle and the frame supported by said roller, a cam shaft on the frame` spring actuated hammers above the cam shaft arranged to be lifted and allowed to fall under the actions of their springs, and means for rotating the cam shaft whereby the hammers will create and impart a series of downwardly directed impulses to the frame which will be transmitted to the roller.

3. A concrete tamper comprising a roller, a frame within the roller, a handle for the roller, means connecting the handle and the frame so as to be capable of holding the frame against rotation with the roller, said means being supported by the roller, and vibrating means on the frame for creating a series of downwardly directed impulses thereto which will be transmitted to the roller,

M. E. WHITEMAN. 

